yes can use use the default values for the fields,

if you want some small number of fields as default value means ,you can use

_default = {

 'your_field' : 'your_default_value'

}

example:

_default = {

 'name' : 'Andrew',

  'age' : 20

}

otherwise,if you want to diplay more values as default means ,you can use

default_get() method

write this code in .py file

_columns = {

     'gender' : fields.selection([('m','Male'),('f','Female')],'Gender')

}

_defaults = {

 'gender' : 'm'

}